1. join及物动词加入（团体，组织，参军）、同……一起干或玩、连接
     例句：①I joined the Party in 1975.（我1975年入党。）
     ②His brother joined the army two years ago.（两年前他哥哥参军。）
     ③They are planning to join the two towns by a railway.（他们在计划用一条铁路把两个镇连接起来。）

2. join in 参加（某些活动）
     例句：①May I join in your discussion?（我可以参加你们的讨论吗？）
     ②Many people join in the game every year.（每年许多人参加这个游戏活动。）
     ③He joined in the work without a second thought.（他未加思索地参加了那项工作。）

3. take part in 参加（群众性活动，会议等）参加者持积极态度，起一份作用。
     例句：①A lot of students took part in the thorough cleaning yesterday.（昨天许多学生参加大扫除。）
     ②A lot of college students took part in the movement last year.
     （去年很多大学生参加了那个运动。）

4. attend 出席，参加，到场；上学
     例句：①Did you attend the meeting last week?
     （上星期你出席会议了吗？）
     ②He was ill so he didn't attend his classes.
     （他生病了，所以没上学。）
     注意：attend的词语搭配
     attend a ceremony 参加典礼
     attend a funeral 参加葬礼
     attend a lecture 听演讲
     attend a concert 听音乐会
     attend church 上教堂